502 - (217 - х) = 421
502-217+х=421
х=421+217-502
х=136
871 - (х + 157) = 385
871-х-157=385
-х=385+157-871
-х=-329
х=329
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502 - (217 - х) = 421
502-217+х=421
х=421+217-502
х=136
871 - (х + 157) = 385
871-х-157=385
-х=385+157-871
-х=-329
х=329
502-217+х=421
х=421-502+217
х=136
Ответ:136
871-(х+157)=385
871-х-157=385
-х=385-871+157
-х=-329
х=329
Ответ:329